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ABC is a triangle such that sin(2A+B)=s...

ABC is a triangle such that `sin(2A+B)=sin(C-A)=-sin(B+2C)=1/2`. If A,B, and C are in AP. then the value of A,B and C are..

A

`45^(@),60^(@),75^(@)`

B

`30^(@), 60^(@), 90^(@)`

C

`20^(@) , 60^(@), 100^(@)`

D

None of these

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A
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